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Recent content by b_unruhly

  1. b_unruhly

    Expected Surface Rougness of a Zn Phosphate treatment on a machined steel bar.

    Unfortunatly it's not that simple when working in emerging manufacturing markets.
  2. b_unruhly

    Expected Surface Rougness of a Zn Phosphate treatment on a machined steel bar.

    @Compositepro, would burnihing makes sense but how do you make sure that it does not remove the Zn phosphate?
  3. b_unruhly

    Expected Surface Rougness of a Zn Phosphate treatment on a machined steel bar.

    Hello all, Not sure if this belongs here or in the chemical section--apologies if I put this in the wrong spot. Hoping to reach a coating expert here. We have a machined shaft we are trying to produce to drawing specs--which call for a Ra (Microinch) value of 20 or under. This is inclusive...
  4. b_unruhly

    Broken Steel Casting with crystalized structure -- Root Cause

    I keep trying to post replies here and it is not comming through. Fingers crossed this works. Thank you all for your replies The client has produced this, as a casting for over a decade without issues. Understand bar or forged would be stronger--but there is a big difference in strength...
  5. b_unruhly

    Broken Steel Casting with crystalized structure -- Root Cause

    The other half of this casting has some more complex geometry for the mating part on the other side. This could have been designed as a press fit assembly, inclusive of a fastener, but was not.
  6. b_unruhly

    Broken Steel Casting with crystalized structure -- Root Cause

    Hello, We have a steel casting that has failed in a new way for me. In the interior of the casting, there is a very apparant crystal structure. Much more dramatic than the "Rock Candy" fractures that I have studdied. it is also only on the interior of the cross section. The part failed...
  7. b_unruhly

    1215 Hot Rolled vs Cold Rolled

    Thank you all very much. This was super informative. I won't be able to try your sugguestions, as our supplier was able to find cold rolled 1215 they could import. But, this has come up countless other times and will keep comming up. Lots of US Spec materials are not available in our...
  8. b_unruhly

    1215 Hot Rolled vs Cold Rolled

    Thank you all for your feedback. Is there somewhere I can find a specific heat treatment protocol to give to the supplier that might give us the properties we are looking for? Over here in this part of the world, playing guess and check can take weeks or months. That's if you find a supplier...
  9. b_unruhly

    1215 Hot Rolled vs Cold Rolled

    Hello, sorry for the missing information--yes we have spec requirements as follows: Bar Diameter: 60mm Ts 65,000-110,000 PSI Yield 55,000-100,000 PSI Elongation in 2": 10-22% Reduction in Area: 25-55% Shrearing Strength PSI ApproxL 55000 Brinell: 143-256 Rockwell Hardness 90-102 It's a round...
  10. b_unruhly

    1215 Hot Rolled vs Cold Rolled

    Hello, Beginner question here--first time poster, long time listener. We are working on a project that specifies Cold Rolled 1215 steel, unfortunatly we only have hot rolled avaiable in our market in the required diameter (60mm) Is there a heat treatment protocol we can prescribe to our hot...
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